How can I use Flex to access foreign-keyed fields in Django?

I need some help!  Please see the question I posted here:

http://stackoverflow.com/questions/481110/how-can-i-use-flex-to-access-foreign-keyed-fields-in-django

Does anyone know of a solution?  The one posted in the thread results in the following error:

ReferenceError: Error #1056: Cannot create property _title_cache on com.myproject.models.vo.BookVO

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